When you think of how optimal nutrition impacts your child’s health, their bones may not be your first concern. After all, osteoporosis largely affects older adults. But, with children building about 40 percent of their bone mass between the ages of 9 to 14, and reaching 90 percent of their peak bone mass by age 18 (for girls) and age 20 (for boys), bone health absolutely is a health issue for kids. Read more.